Powerbacks Free Sampler: Powerbacks Free Sampler lets you liven up your PowerPoint presentations with this free set of 48 1024x768 .jpg images from the Powerbacks 2000 collection. You get four kinds of slides (Advanced, Artzy, Basic, and Sets) with a dozen graphics of each type. Half are suitable for text backgrounds, while tghe remaining images (such as "Break Outs" or "Coffe Break") can stand on their own.